3 ms·You can purchase a Faraday cage for your phone. Or you can make one.by whatamidoingyo 1y agoYou can purchase a Faraday cage for your phone. Or you can make one.natas 1y agoall cars should have onethfuran 1y agoThey’re too busy spying themselves.egberts1 1y ago50-ohm resistor end-cap connector to antenna of your car GPS should suffice.